/* style.css */
:root {
    --bg-color: #f4f7fc;
    --text-color: #333;
    --header-bg: #ffffff;
    --card-bg: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --primary-color: #4a69bd;
    --primary-hover: #5d82d1;
    --input-bg: #fff;
    --input-border: #dfe4ea;
    --label-color: #6c757d;
    --th-bg: #f8f9fa;
    --td-border: #e9ecef;
    --alert-success-bg: #d4edda;
    --alert-success-color: #155724;
    --alert-error-bg: #f8d7da;
    --alert-error-color: #721c24;
    --danger-color: #e74c3c;
    --danger-hover: #c0392b;
    --success-color: #2ecc71;
    --success-hover: #27ae60;
    --warning-color: #f39c12;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --header-bg: #1e1e1e;
    --card-bg: #1e1e1e;
    --shadow-color: rgba(255, 255, 255, 0.05);
    --primary-color: #5d82d1;
    --primary-hover: #769ae3;
    --input-bg: #2c2c2c;
    --input-border: #444;
    --label-color: #a0a0a0;
    --th-bg: #2c2c2c;
    --td-border: #333;
    --alert-success-bg: #275c36;
    --alert-success-color: #d4edda;
    --alert-error-bg: #6b2b31;
    --alert-error-color: #f8d7da;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    min-height: 100vh;
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
}

.login-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-card {
    background-color: var(--card-bg);
    padding: 50px 40px;
    border-radius: 20px;
    box-shadow: 0 8px 25px var(--shadow-color);
    width: 100%;
    max-width: 450px;
    border: 1px solid var(--input-border);
}

/* Layout principal */
.main-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header.main-header {
    background-color: var(--header-bg);
    padding: 0 40px;
    box-shadow: 0 2px 10px var(--shadow-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--input-border);
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.welcome-message { color: var(--label-color); font-size: 14px; }

header .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

header nav {
    display: flex;
    align-items: center;
    gap: 25px;
}

header nav a {
    color: var(--label-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
    padding: 5px 0;
}

header nav a:hover, header nav a.active {
    color: var(--primary-color);
}

header nav a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.container {
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 40px;
    flex-grow: 1;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.page-header h2 {
    margin-bottom: 0;
    border-bottom: none;
}

h1, h2, h3 {
    margin-bottom: 20px;
    color: var(--text-color);
    font-weight: 600;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; border-bottom: 1px solid var(--input-border); padding-bottom: 10px; }
h3 { font-size: 1.25rem; }

.card {
    background: var(--card-bg);
    padding: 25px;
    margin-bottom: 30px;
    border-radius: 12px;
    border: 1px solid var(--input-border);
    box-shadow: 0 4px 15px var(--shadow-color);
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
    color: var(--label-color);
    font-size: 14px;
    font-weight: 500;
}

input, select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    transition: all 0.3s ease;
    background-color: var(--input-bg);
    font-size: 1rem;
    color: var(--text-color);
}

input:focus, select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 105, 189, 0.2);
}

button {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: var(--primary-hover);
}

.alert {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid transparent;
}

.alert-success { background-color: var(--alert-success-bg); color: var(--alert-success-color); border-color: var(--alert-success-color); }
.alert-error { background-color: var(--alert-error-bg); color: var(--alert-error-color); border-color: var(--alert-error-color); }

a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

a:hover {
    color: var(--primary-hover);
}

/* --- Styles pour les tableaux (Stocks & Utilisateurs) --- */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    border-spacing: 0;
    border: 1px solid var(--td-border);
}

th {
    background-color: var(--th-bg);
    color: var(--text-color);
    padding: 15px;
    text-align: left;
    font-weight: 600;
    border: 1px solid var(--td-border);
}

td {
    padding: 15px;
    border: 1px solid var(--td-border);
    vertical-align: middle;
    color: var(--text-color);
}

tr:nth-child(even) {
    background-color: var(--th-bg);
}

/* Inputs inside tables */
.quantity-input, .input-small {
    padding: 8px;
    border-radius: 6px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: border-color 0.2s;
}

.quantity-input:focus, .input-small:focus {
    outline: none;
    border-color: var(--primary-color);
}

.quantity-input {
    width: 75px;
}

.input-small {
    width: 140px;
}

/* Action forms/groups inside tables */
.action-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

.action-form {
    margin: 0;
    display: flex;
    gap: 5px;
    align-items: center;
}

.btn-small {
    padding: 8px 12px;
    font-size: 14px;
    border-radius: 8px;
    width: auto;
    font-weight: bold;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    transition: all 0.2s ease;
}

.btn-danger {
    background-color: var(--danger-color);
}
.btn-danger:hover { background-color: var(--danger-hover); }

.btn-success {
    background-color: var(--success-color);
}
.btn-success:hover { background-color: var(--success-hover); }

.btn-small:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

.badge {
    padding: 5px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: bold;
    color: white;
    text-transform: capitalize;
}

.badge-admin { background-color: var(--primary-color); }
.badge-client { background-color: #17a2b8; }
.badge-professeur { background-color: #6f42c1; } /* Violet */
.badge-etudiant { background-color: #17a2b8; } /* Cyan */
.badge-warning { background-color: var(--warning-color); }
.badge-success { background-color: var(--success-color); }
.badge-danger { background-color: var(--danger-color); }

.theme-toggle {
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--input-border);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    width: auto;
    transition: all 0.2s;
}
.theme-toggle:hover { background-color: var(--input-border); }

/* Notifications */
.notifications-container {
    margin-bottom: 30px;
}
.notification-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    margin-bottom: 10px;
}
.notification-item p { margin: 0; }
.notification-item form { margin: 0; }

/* Classes utilitaires de texte */
.text-danger {
    color: var(--danger-color);
    font-weight: 500;
}

.text-muted {
    color: var(--label-color);
    font-size: 0.9em;
}

/* Screen-reader only class */
.sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0;
}